So as a follow up. One of my licence states that :
Prohibited Uses
The audio files licensed under this agreement, may not be used in any product that is primarily nature audio and
therefore would compete with other present and future ***************** products. Primarily, for the purposes of this
agreement, is defined as containing pure nature sounds (without voice, music, human or machine sounds or other
non-natural sounds) for at least 50% of the total elapsed time of the product. Examples of prohibited products would
be environmental soundscape albums, internet radio programming consisting of only nature sounds, nature videos
without narration, some mobile applications, and ringtones. If in doubt inquire with ******************* before using.
Derivatives
All derivatives of licensed audio files, whether created in part or whole of the file licensed by this agreement, either by
mixing, editing, processing or any other means remain bound by the terms and restrictions of this Agreement.
Which, and tell me if I'm wrong please, tells me that I can actually do derivative and sell them as long as it doesn't end up as another nature sound (in this particular case). If it doesn't end up as nature sounds (again in this particular case) I have no worries that people could use my derivative to make nature stuff themselves since it would sound like something else, hence I do follow the derivative rule.
Another one says this : (this is actually the Boom one on their website)
LIMITATIONS:
This license expressly forbids any unauthorized inclusion of the CONTENT in any library (e.g. sample instrument, sound effects library, etc.) online or offline without our express written consent.
The MEDIA LICENSE also forbids any re-distribution method of the CONTENT, through any means, including but not limited to, re-selling, trading, sharing, resampling, mixing, processing, isolating, or embedding into software or hardware of any kind, for the purpose of re-recording or reproduction as part of any free or commercial library of musical and/or sound effect samples and/or articulations, or any form of musical sample or sound effect sample playback system or device.
So obviously it means I can't re-sell them which is pretty obvious, but I don't understand if it includes work that I might do with the content.
Let's say I take a fire sound and an animal sound and I make some kind of dragon breath, it's made with their content but it's not really a sound they have.
Is it what they mean with the "resampling" and "processing" parts?